Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 62,027	$ 90,471
Short-term marketable securities		325
Accounts receivable—net of allowance of $199 and $225 at June 30, 2016 and December 31, 2015, respectively	41,327	9,523
Prepaid expenses	4,983	5,010
Other current assets	583	614
Total current assets	108,920	105,943
Property and equipment, net	13,242	11,732
Goodwill	989	989
Intangible assets, net	576	444
Noncurrent prepaid expenses	785	749
Other assets	1,069	1,203
Total assets	125,581	121,060
Current liabilities:
Accounts payable	3,816	3,912
Accrued liabilities	10,428	8,852
Deferred rent	658	541
Deferred revenue	72,983	49,384
Total current liabilities	87,885	62,689
Deferred revenue, net of current portion	3,136	2,941
Deferred rent, net of current portion	8,721	9,078
Warrant liability	25	331
Other long-term liabilities	65	402
Total liabilities	99,832	75,441
Stockholders’ equity:
Common stock	3	4
Treasury stock		(1)
Additional paid-in capital	196,976	188,517
Accumulated deficit	(171,230)	(142,901)
Total stockholders’ equity	25,749	45,619
Total liabilities and stockholders’ equity	$ 125,581	$ 121,060